Magic Jack is a little USB device which you can hook it up to your computer's USB port to make calls to any home telephones. To use it connect Magic Jack to your computer's USB port plug a telephone line home phone to the RJ11 port (phone jack) of Magic Jack and the software on it will load automatically to let you dial your numbers for making calls. Magic Jack is a complete phone service that comes with a phone number that you can make local and long distance calls. Also it includes free voicemail service for receiving messages whether you're offline or online. Some other common services seen in phone services such as caller ID call waiting free directory assistance call forwarding free three way calling and 911 are also included with Magic Jack.